linux-kernel - [tip:sched/core] sched: Fix TASK

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Date:	Thu, 17 Sep 2009 07:49:02 GMT
From:	tip-bot for Ingo Molnar <mingo@...e.hu>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	a.p.zijlstra@...llo.nl, efault@....de, tglx@...utronix.de,
	mingo@...e.hu
Subject: [tip:sched/core] sched: Fix TASK_WAKING & loadaverage breakage

Commit-ID:  7d3c375e2281ec5f0e63f58e3fbfd0b41e530595
Gitweb:     http://git.kernel.org/tip/7d3c375e2281ec5f0e63f58e3fbfd0b41e530595
Author:     Ingo Molnar <mingo@...e.hu>
AuthorDate: Wed, 16 Sep 2009 21:09:13 +0200
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Thu, 17 Sep 2009 09:37:08 +0200

sched: Fix TASK_WAKING & loadaverage breakage

Fix this:

top - 21:54:00 up  2:59,  1 user,  load average: 432512.33, 426421.74, 417432.74

Which happens because we now set TASK_WAKING before activate_task().

Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Mike Galbraith <efault@....de>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 kernel/sched.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/kernel/sched.c b/kernel/sched.c
index f55133c..3bb4ea2 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -2343,7 +2343,11 @@ static int try_to_wake_up(struct task_struct *p, unsigned int state,
 	/*
 	 * In order to handle concurrent wakeups and release the rq->lock
 	 * we put the task in TASK_WAKING state.
+	 *
+	 * First fix up the nr_uninterruptible count:
 	 */
+	if (task_contributes_to_load(p))
+		rq->nr_uninterruptible--;
 	p->state = TASK_WAKING;
 	task_rq_unlock(rq, &flags);
 
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